%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(exception_SUITE).
-export([all/0, suite/0,groups/0,init_per_group/2,end_per_group/2, badmatch/1, pending_errors/1, nil_arith/1,
stacktrace/1, nested_stacktrace/1, raise/1, gunilla/1, per/1,
exception_with_heap_frag/1]).
-export([bad_guy/2]).
-include_lib("test_server/include/test_server.hrl").
-import(lists, [foreach/2]).
suite() -> [{suite_callbacks,[ts_install_scb]}].
all() ->
[badmatch, pending_errors, nil_arith, stacktrace,
nested_stacktrace, raise, gunilla, per,
exception_with_heap_frag].
groups() ->
[].
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
-define(try_match(E),
catch ?MODULE:bar(),
{'EXIT', {{badmatch, nomatch}, _}} = (catch E = id(nomatch))).
%% Test that deliberately bad matches are reported correctly.
badmatch(Config) when is_list(Config) ->
?line ?try_match(a),
?line ?try_match(42),
?line ?try_match({a, b, c}),
?line ?try_match([]),
?line ?try_match(1.0),
ok.
%% Test various exceptions, in the presence of a previous error suppressed
%% in a guard.
pending_errors(Config) when is_list(Config) ->
?line pending(e_badmatch, {badmatch, b}),
?line pending(x, function_clause),
?line pending(e_case, {case_clause, xxx}),
?line pending(e_if, if_clause),
?line pending(e_badarith, badarith),
?line pending(e_undef, undef),
?line pending(e_timeoutval, timeout_value),
?line pending(e_badarg, badarg),
?line pending(e_badarg_spawn, badarg),
ok.
bad_guy(pe_badarith, Other) when Other+1 == 0 -> % badarith (suppressed)
ok;
bad_guy(pe_badarg, Other) when length(Other) > 0 -> % badarg (suppressed)
ok;
bad_guy(_, e_case) ->
case id(xxx) of
ok -> ok
end; % case_clause
bad_guy(_, e_if) ->
if
a == b -> ok
end; % if_clause
bad_guy(_, e_badarith) ->
1+b; % badarith
bad_guy(_, e_undef) ->
non_existing_module:foo(); % undef
bad_guy(_, e_timeoutval) ->
receive
after arne -> % timeout_value
ok
end;
bad_guy(_, e_badarg) ->
node(xxx); % badarg
bad_guy(_, e_badarg_spawn) ->
spawn({}, {}, {}); % badarg
bad_guy(_, e_badmatch) ->
a = id(b). % badmatch
pending(Arg, Expected) ->
pending(pe_badarith, Arg, Expected),
pending(pe_badarg, Arg, Expected).
pending(First, Second, Expected) ->
pending_catched(First, Second, Expected),
pending_exit_message([First, Second], Expected).
pending_catched(First, Second, Expected) ->
ok = io:format("Catching bad_guy(~p, ~p)", [First, Second]),
case catch bad_guy(First, Second) of
{'EXIT', Reason} ->
pending(Reason, bad_guy, [First, Second], Expected);
Other ->
test_server:fail({not_exit, Other})
end.
pending_exit_message(Args, Expected) ->
ok = io:format("Trapping EXITs from spawn_link(~p, ~p, ~p)",
[?MODULE, bad_guy, Args]),
process_flag(trap_exit, true),
Pid = spawn_link(?MODULE, bad_guy, Args),
receive
{'EXIT', Pid, Reason} ->
pending(Reason, bad_guy, Args, Expected);
Other ->
test_server:fail({unexpected_message, Other})
after 10000 ->
test_server:fail(timeout)
end,
process_flag(trap_exit, false).
pending({badarg, [{erlang,Bif,BifArgs},{?MODULE,Func,Arity}|_]}, Func, Args, _Code)
when is_atom(Bif), is_list(BifArgs), length(Args) == Arity ->
ok;
pending({undef,[{non_existing_module,foo,[]}|_]}, _, _, _) ->
ok;
pending({function_clause,[{?MODULE,Func,Args}|_]}, Func, Args, _Code) ->
ok;
pending({Code,[{?MODULE,Func,Arity}|_]}, Func, Args, Code) when length(Args) == Arity ->
ok;
pending(Reason, _Function, _Args, _Code) ->
test_server:fail({bad_exit_reason,Reason}).
%% Test that doing arithmetics on [] gives a badarith EXIT and not a crash.
nil_arith(Config) when is_list(Config) ->
?line ba_plus_minus_times([], []),
?line ba_plus_minus_times([], 0),
?line ba_plus_minus_times([], 42),
?line ba_plus_minus_times([], 38724978123478923784),
?line ba_plus_minus_times([], 38.72),
?line ba_plus_minus_times(0, []),
?line ba_plus_minus_times(334, []),
?line ba_plus_minus_times(387249797813478923784, []),
?line ba_plus_minus_times(344.22, []),
?line ba_div_rem([], []),
?line ba_div_rem([], 0),
?line ba_div_rem([], 1),
?line ba_div_rem([], 42),
?line ba_div_rem([], 38724978123478923784),
?line ba_div_rem(344.22, []),
?line ba_div_rem(0, []),
?line ba_div_rem(1, []),
?line ba_div_rem(334, []),
?line ba_div_rem(387249797813478923784, []),
?line ba_div_rem(344.22, []),
?line ba_div_rem(344.22, 0.0),
?line ba_div_rem(1, 0.0),
?line ba_div_rem(392873498733971, 0.0),
?line ba_bop([], []),
?line ba_bop(0, []),
?line ba_bop(42, []),
?line ba_bop(-42342742987343, []),
?line ba_bop(238.342, []),
?line ba_bop([], 0),
?line ba_bop([], -243),
?line ba_bop([], 243),
?line ba_bop([], 2438724982478933),
?line ba_bop([], 3987.37),
?line ba_bnot([]),
?line ba_bnot(23.33),
?line ba_shift([], []),
?line ba_shift([], 0),
?line ba_shift([], 4),
?line ba_shift([], -4),
?line ba_shift([], 2343333333333),
?line ba_shift([], -333333333),
?line ba_shift([], 234.00),
?line ba_shift(23, []),
?line ba_shift(0, []),
?line ba_shift(-3433443433433323, []),
?line ba_shift(433443433433323, []),
?line ba_shift(343.93, []),
ok.
ba_plus_minus_times(A, B) ->
io:format("~p + ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A + B),
io:format("~p - ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A - B),
io:format("~p * ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A * B).
ba_div_rem(A, B) ->
io:format("~p / ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A / B),
io:format("~p div ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A div B),
io:format("~p rem ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A rem B).
ba_bop(A, B) ->
io:format("~p band ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A band B),
io:format("~p bor ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bor B),
io:format("~p bxor ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bxor B).
ba_shift(A, B) ->
io:format("~p bsl ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bsl B),
io:format("~p bsr ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bsr B).
ba_bnot(A) ->
io:format("bnot ~p", [A]),
{'EXIT', {badarith, _}} = (catch bnot A).
stacktrace(Conf) when is_list(Conf) ->
Tag = make_ref(),
?line {_,Mref} = spawn_monitor(fun() -> exit({Tag,erlang:get_stacktrace()}) end),
?line {Tag,[]} = receive {'DOWN',Mref,_,_,Info} -> Info end,
V = [make_ref()|self()],
?line {value2,{caught1,badarg,[{erlang,abs,[V]}|_]=St1}} =
stacktrace_1({'abs',V}, error, {value,V}),
?line St1 = erase(stacktrace1),
?line St1 = erase(stacktrace2),
?line St1 = erlang:get_stacktrace(),
?line {caught2,{error,badarith},[{?MODULE,my_add,2}|_]=St2} =
stacktrace_1({'div',{1,0}}, error, {'add',{0,a}}),
?line [{?MODULE,my_div,2}|_] = erase(stacktrace1),
?line St2 = erase(stacktrace2),
?line St2 = erlang:get_stacktrace(),
?line {caught2,{error,{try_clause,V}},[{?MODULE,stacktrace_1,3}|_]=St3} =
stacktrace_1({value,V}, error, {value,V}),
?line St3 = erase(stacktrace1),
?line St3 = erase(stacktrace2),
?line St3 = erlang:get_stacktrace(),
?line {caught2,{throw,V},[{?MODULE,foo,1}|_]=St4} =
stacktrace_1({value,V}, error, {throw,V}),
?line [{?MODULE,stacktrace_1,3}|_] = erase(stacktrace1),
?line St4 = erase(stacktrace2),
?line St4 = erlang:get_stacktrace(),
ok.
stacktrace_1(X, C1, Y) ->
erase(stacktrace1),
erase(stacktrace2),
try try foo(X) of
C1 -> value1
catch
C1:D1 -> {caught1,D1,erlang:get_stacktrace()}
after
put(stacktrace1, erlang:get_stacktrace()),
foo(Y)
end of
V2 -> {value2,V2}
catch
C2:D2 -> {caught2,{C2,D2},erlang:get_stacktrace()}
after
put(stacktrace2, erlang:get_stacktrace())
end.
nested_stacktrace(Conf) when is_list(Conf) ->
V = [{make_ref()}|[self()]],
?line value1 =
nested_stacktrace_1({{value,{V,x1}},void,{V,x1}},
{void,void,void}),
?line {caught1,
[{?MODULE,my_add,2}|_],
value2,
[{?MODULE,my_add,2}|_]} =
nested_stacktrace_1({{'add',{V,x1}},error,badarith},
{{value,{V,x2}},void,{V,x2}}),
?line {caught1,
[{?MODULE,my_add,2}|_],
{caught2,[{erlang,abs,[V]}|_]},
[{erlang,abs,[V]}|_]} =
nested_stacktrace_1({{'add',{V,x1}},error,badarith},
{{'abs',V},error,badarg}),
ok.
nested_stacktrace_1({X1,C1,V1}, {X2,C2,V2}) ->
try foo(X1) of
V1 -> value1
catch
C1:V1 ->
S1 = erlang:get_stacktrace(),
T2 =
try foo(X2) of
V2 -> value2
catch
C2:V2 -> {caught2,erlang:get_stacktrace()}
end,
{caught1,S1,T2,erlang:get_stacktrace()}
end.
raise(Conf) when is_list(Conf) ->
?line erase(raise),
?line A =
try
?line try foo({'div',{1,0}})
catch
error:badarith ->
put(raise, A0 = erlang:get_stacktrace()),
?line erlang:raise(error, badarith, A0)
end
catch
error:badarith ->
?line A1 = erlang:get_stacktrace(),
?line A1 = get(raise)
end,
?line A = erlang:get_stacktrace(),
?line A = get(raise),
?line [{?MODULE,my_div,2}|_] = A,
%%
N = 8, % Must be even
?line N = erlang:system_flag(backtrace_depth, N),
?line try even(N)
catch error:function_clause -> ok
end,
?line B = odd_even(N, []),
?line B = erlang:get_stacktrace(),
%%
?line C0 = odd_even(N+1, []),
?line C = lists:sublist(C0, N),
?line try odd(N+1)
catch error:function_clause -> ok
end,
?line C = erlang:get_stacktrace(),
?line try erlang:raise(error, function_clause, C0)
catch error:function_clause -> ok
end,
?line C = erlang:get_stacktrace(),
ok.
odd_even(N, R) when is_integer(N), N > 1 ->
odd_even(N-1,
[if (N rem 2) == 0 ->
{?MODULE,even,1};
true ->
{?MODULE,odd,1}
end|R]);
odd_even(1, R) ->
[{?MODULE,odd,[1]}|R].
even(N) when is_integer(N), N > 1, (N rem 2) == 0 ->
odd(N-1)++[N].
odd(N) when is_integer(N), N > 1, (N rem 2) == 1 ->
even(N-1)++[N].
foo({value,Value}) -> Value;
foo({'div',{A,B}}) ->
my_div(A, B);
foo({'add',{A,B}}) ->
my_add(A, B);
foo({'abs',X}) ->
my_abs(X);
foo({error,Error}) ->
erlang:error(Error);
foo({throw,Throw}) ->
erlang:throw(Throw);
foo({exit,Exit}) ->
erlang:exit(Exit);
foo({raise,{Class,Reason,Stacktrace}}) ->
erlang:raise(Class, Reason, Stacktrace).
%%foo(function_clause) -> % must not be defined!
my_div(A, B) ->
A div B.
my_add(A, B) ->
A + B.
my_abs(X) -> abs(X).
gunilla(Config) when is_list(Config) ->
?line {throw,kalle} = gunilla_1(),
?line [] = erlang:get_stacktrace(),
ok.
gunilla_1() ->
try try arne()
after
pelle
end
catch
C:R ->
{C,R}
end.
arne() ->
%% Empty stack trace used to cause change the error class to 'error'.
erlang:raise(throw, kalle, []).
per(Config) when is_list(Config) ->
try
t1(0,pad,0),
t2(0,pad,0)
catch
error:badarith ->
ok
end.
t1(_,X,_) ->
(1 bsl X) + 1.
t2(_,X,_) ->
(X bsl 1) + 1.
%%
%% Make sure that even if a BIF builds an heap fragment, then causes an exception,
%% the stacktrace term will still be OK (specifically, that it does not contain
%% stale pointers to the arguments).
%%
exception_with_heap_frag(Config) when is_list(Config) ->
Sizes = lists:seq(0, 512),
%% Floats are only validated when the heap fragment has been allocated.
BadFloat = <<131,99,53,46,48,$X,48,48,48,48,48,48,48,48,48,48,48,48,48,48,48,48,48,48,101,45,48,49,0,0,0,0,0>>,
?line do_exception_with_heap_frag(BadFloat, Sizes),
%% {Binary,BadFloat}: When the error in float is discovered, a refc-binary
%% has been allocated and the list of refc-binaries goes through the
%% heap fragment.
BinAndFloat =
<<131,104,2,109,0,0,1,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,
21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,
46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,
71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,
116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,
135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,
154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,
173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,
211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,
230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,
249,250,251,252,253,254,255,99,51,46,49,52,$B,$l,$u,$r,$f,48,48,48,48,48,48,
48,48,49,50,52,51,52,101,43,48,48,0,0,0,0,0>>,
?line do_exception_with_heap_frag(BinAndFloat, Sizes),
%% {Fun,BadFloat}
FunAndFloat =
<<131,104,2,112,0,0,0,66,0,238,239,135,138,137,216,89,57,22,111,52,126,16,84,
71,8,0,0,0,0,0,0,0,0,100,0,1,116,97,0,98,5,175,169,123,103,100,0,13,110,111,
110,111,100,101,64,110,111,104,111,115,116,0,0,0,41,0,0,0,0,0,99,50,46,55,48,
$Y,57,57,57,57,57,57,57,57,57,57,57,57,57,54,52,52,55,101,43,48,48,0,0,0,0,0>>,
?line do_exception_with_heap_frag(FunAndFloat, Sizes),
%% [ExternalPid|BadFloat]
ExtPidAndFloat =
<<131,108,0,0,0,1,103,100,0,13,107,97,108,108,101,64,115,116,114,105,100,101,
114,0,0,0,36,0,0,0,0,2,99,48,46,$@,48,48,48,48,48,48,48,48,48,48,48,48,48,48,
48,48,48,48,48,101,43,48,48,0,0,0,0,0>>,
?line do_exception_with_heap_frag(ExtPidAndFloat, Sizes),
ok.
do_exception_with_heap_frag(Bin, [Sz|Sizes]) ->
Filler = erlang:make_tuple(Sz, a),
spawn(fun() ->
try
binary_to_term(Bin)
catch
_:_ ->
%% term_to_binary/1 is an easy way to traverse the
%% entire stacktrace term to make sure that every part
%% of it is OK.
term_to_binary(erlang:get_stacktrace())
end,
id(Filler)
end),
do_exception_with_heap_frag(Bin, Sizes);
do_exception_with_heap_frag(_, []) -> ok.
id(I) -> I.
